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Provides a content assist add-on for an <code>ITextViewer</code>.
Content assist supports the user in writing&nbsp; by proposing context
sensitive completions at a given document position. A completion can also
be a incomplete in itself and content assist provides means to deal with
nested completions.
<h2>
Package Specification</h2>
<code>IContentAssistant</code> defines the concept of the content assist add-on.
It collaborates with content type specific completion processors (<code>IContentAssistProcessor</code>)
in order to generate completion proposals (<code>ICompletionProposal</code>)
valid at the current document position. The package provides a default
implementation <code>ContentAssistant</code> which completely defines and implements
the UI and the control flow for content assist.
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